I have a yoshimura 6 spd close ratio gear box,...no electric start or kickstart, bumpstart only. Also have a yosh 5 speed CR, can't remember but I had to give up one starting method for that one?
I remember some of the gears came in honda packages, I always wondered if you could borrow different ratios from other models then mix n match? They made a big difference on the track with a peaky motor, but had real tall first gears, not great for the street.